I really dont understand how this works

Question

alright first off this isnt for a school assignment so please dont feel guilty about "giving it away"
alright so this has to do with something called gridworld, if you ever seen it you know what it is, if you havents its basiclly a java built world that has bugs, rocks, flowers, and other things.
(here is a video showing the basics of gridworld http://www.youtube.com/watch?v=ZnWGOT5Bd2E&feature=related). i program in JCreator btw not greenfoot.
alright getting to the point i have the code for a bug someone build called a "chameleoncritter". what the bug does is change colors depending on what it is next to, so if it is next to a pink rock it changes pink, ive been reading the code and can honestly not figure out how this method changes its color depending on what it is next to. here is the code
* AP(r) Computer Science GridWorld Case Study:
* Copyright(c) 2005-2006 Cay S. Horstmann (http://horstmann.com)
* This code is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation.
* This code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
* @author Chris Nevison
* @author Barbara Cloud Wells
* @author Cay Horstmann
import info.gridworld.actor.Actor;
import info.gridworld.actor.Critter;
import info.gridworld.grid.Location;
import java.util.ArrayList;
* A <code>ChameleonCritter</code> takes on the color of neighboring actors as
* it moves through the grid. <br />
* The implementation of this class is testable on the AP CS A and AB exams.
public class ChameleonCritter extends Critter
     * Randomly selects a neighbor and changes this critter's color to be the
     * same as that neighbor's. If there are no neighbors, no action is taken.
    public void processActors(ArrayList<Actor> actors)
        int n = actors.size();
        if (n == 0)
            return;
        int r = (int) (Math.random() * n);
        System.out.println(n);
        Actor other = actors.get(r);
        setColor(other.getColor());
     * Turns towards the new location as it moves.
    public void makeMove(Location loc)
        setDirection(getLocation().getDirectionToward(loc));
        super.makeMove(loc);
}if anyone can explain to me how this works it would be excellent.
one more thing, here is a link to the gridworld api (list every method and class and its function).
http://www.horstmann.com/gridworld/javadoc/
Edited by: vouslavous on Apr 17, 2009 8:51 PM

Answer 1

public void processActors(ArrayList<Actor> actors)
        int n = actors.size();
        if (n == 0)
            return;
        int r = (int) (Math.random() * n);
        System.out.println(n);
        Actor other = actors.get(r);
        setColor(other.getColor());
}Randomly selects a neighbor and changes this critter's color to be the same as that neighbor's. If there are no neighbors, no action is taken.
Mel